Official Go implementation of the Ethereum protocol
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go-ethereum/core/vm/analysis.go

36 lines
849 B

package vm
import (
"math/big"
"gopkg.in/fatih/set.v0"
)
type destinations struct {
set *set.Set
}
func (d *destinations) Has(dest *big.Int) bool {
return d.set.Has(string(dest.Bytes()))
}
func (d *destinations) Add(dest *big.Int) {
d.set.Add(string(dest.Bytes()))
}
func analyseJumpDests(code []byte) (dests *destinations) {
dests = &destinations{set.New()}
for pc := uint64(0); pc < uint64(len(code)); pc++ {
var op OpCode = OpCode(code[pc])
switch op {
case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
a := uint64(op) - uint64(PUSH1) + 1
pc += a
case JUMPDEST:
dests.Add(big.NewInt(int64(pc)))
}
}
return
}